package com.base.common.action;

import com.base.common.GlobaConstants;
import com.base.common.bean.ActionResult;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.subject.Subject;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.Results;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Random;

/**
 * User: jay.zhoujingjie
 * Date: 14-1-16
 * Time: 上午9:26
 */
@Action("systemAction")
@Results({
        @Result(name = "image",type = "stream",params ={GlobaConstants.CONTENT_TYPE, GlobaConstants.CONTENT_TYPE_JPG, "inputName", "inputStream" }),
        @Result(name = GlobaConstants.ASYNCHRONOUS,type = GlobaConstants.JSON,params = {GlobaConstants.ROOT,GlobaConstants.ACTION_RESULT})
})
public class SystemAction extends AbstractBaseAction
{							// 配置文件服务类
	private Integer	height;													    // 验证码高度
	private InputStream inputStream;
	private char[]	str	= "123456789qwertyuipasdfghjklzxcvbnm".toCharArray();	// 验证码最近出现的字符，已去掉0和o
    private String validateCode;
    private Integer	width;													    // 验证码宽度

    /**
     * 检查验证码是否正确
     * @return
     */
    public String checkValidateCode(){
        actionResult = ActionResult.getActionResult(false);
        if(validateCode != null){
            if(validateCode.equals(String.valueOf(session.get("checkCode")))){
                actionResult = ActionResult.getActionResult(true);
            }
        }
        return GlobaConstants.ASYNCHRONOUS;
    }

    /**
	 * 创建随机函数随机出现四位验证码
	 * @return String
	 */
	private String generateCode(Integer length,Graphics g)
	{
		Date date = new Date();
		date.toString();
		// 得到随机产生的验证码数字。
		StringBuilder code = new StringBuilder();
		Random random = new Random();
		for(int i = 0;i < length;i++)
		{
			char rand = str[random.nextInt(str.length - 1)];
			// 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。

			int red = random.nextInt(255);
			int green = random.nextInt(165);
			int blue = random.nextInt(1);
			// 用随机产生的颜色将验证码绘制到图像中。
			g.setColor(new Color(red, green, blue));
			g.drawString(String.valueOf(rand), (i+1)*(width - 4) / (length + 1), height - 7);
			// 将产生的四个随机数组合在一起。
			code.append(rand);
		}
		return code.toString();
	}

    /**
     * 生成图
     * @param g
     * @return
     */
    private Graphics generateGraphics(Graphics g){
        // 将图形填充为白色
        g.setColor(Color.LIGHT_GRAY);
        g.fillRect(0, 0, width, height);
        // 创建字体，字体的大小应该根据图片的高度来定。
        g.setFont(new Font("Fixedsys", Font.PLAIN, height - 10));
        // 画边框。
        g.setColor(Color.WHITE);
        g.drawRect(0, 0, width - 1, height - 1);
        return g;
    }

    /**
     * 生成干扰点
     */
    private void generateSpot(Graphics graphics){
        Random random = new Random();
         for(int i=0;i<250;i++){
             int x = (int) (Math.random() * width);
             int y = (int) (Math.random() * height);
             graphics.setColor(new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255)));
             graphics.drawOval(x, y, 1, 0);
         }
    }

    public Integer getHeight()
    {
        return height;
    }

    public InputStream getInputStream()
    {
        return inputStream;
    }

    public String getValidateCode()
    {
        return validateCode;
    }

    public Integer getWidth()
    {
        return width;
    }

    /**
	 * 注销和退出方法，作用在于清除session
	 * @author scott.suhao
	 */
	public String logoutSys() {
		// 注销session
		Subject currentUser=SecurityUtils.getSubject();
		currentUser.logout();
		return GlobaConstants.ASYNCHRONOUS;
	}

    public void setHeight(Integer height)
    {
        this.height = height;
    }

    public void setInputStream(InputStream inputStream)
    {
        this.inputStream = inputStream;
    }
	public void setValidateCode(String validateCode)
    {
        this.validateCode = validateCode;
    }

    public void setWidth(Integer width)
    {
        this.width = width;
    }

	/**
	 * 验证码
	 * @return
	 */
	public String validateCode() throws IOException
	{

        if(width == null){
            width = 87;
        }
        if(height == null){
            height = 37;
        }
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        //生成图
        Graphics g = generateGraphics(image.getGraphics());
		// 随机产生干扰点，使图象中的认证码不易被其它程序探测到。
        generateSpot(g);
		// randomCode用于保存随机产生的验证码，以便用户登录后进行验证。
		String randCode = generateCode(4, g);

		// 禁止图像缓存。
		response.setHeader("Pragma", "no-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);
		// 将图像输出到Servlet输出流中。
		ByteArrayOutputStream sos = new ByteArrayOutputStream();
		ImageIO.write(image, "jpeg", sos);
        inputStream = new ByteArrayInputStream(sos.toByteArray());
		sos.close();
        // 将四位数字的验证码保存到Session中。
        session.put("checkCode", randCode);
		return "image";
	}
}
